Frost dates for Marseilles Lock, IL
At Marseilles Lock, the median last spring frost (32°F) is Apr 27 and the median first fall frost is Oct 17, for a typical growing season of 171 days. For a 90% chance that the last frost has passed, wait until May 13. Nearby ZIP codes are in USDA hardiness zone 5b.
- Apr 27Last spring frost (median)50% chance of 32°F after this date
- May 13Safer planting date10% chance of 32°F after this date
- Oct 17First fall frost (median)50% chance of 32°F by this date
- 171 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Apr 22 | May 7 | May 22 |
| 32°F | Apr 12 | Apr 27 | May 13 |
| 28°F | Apr 2 | Apr 15 | May 1 |
| 24°F | Mar 17 | Apr 3 | Apr 18 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Sep 24 | Oct 7 | Oct 20 |
| 32°F | Oct 3 | Oct 17 | Oct 29 |
| 28°F | Oct 14 | Oct 27 | Nov 9 |
| 24°F | Oct 26 | Nov 5 | Nov 22 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 131 days | 152 days | 170 days |
| 32°F | 151 days | 171 days | 191 days |
| 28°F | 173 days | 194 days | 215 days |
| 24°F | 196 days | 217 days | 239 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 61341 | 5b | -15 to -10°F | 6 km |
| 61325 | 5b | -15 to -10°F | 11 km |
| 61360 | 5b | -15 to -10°F | 13 km |
| 60557 | 5b | -15 to -10°F | 13 km |
| 60549 | 5b | -15 to -10°F | 19 km |
| 60551 | 5b | -15 to -10°F | 23 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00115372, at 41.3286, -88.7533, elevation 149 m (490 ft).
- Data quality: Representative (10+ years), 24 years of freeze data.
- Average days per year at or below 32°F: 139.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Ottawa 5sw (13 km)
- Streator 3 SE (27 km)
- Morris 1 NW (27 km)
- Peru (30 km)
- Dwight (38 km)
- Channahon Dresden Isl Dam (40 km)
- Paw Paw 2s (42 km)
- Hennepin Wtr Trmt Plant (49 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.